Legendary Native American Figures: Piasa Bird (Piesa)

The "Piasa Bird" is not actually a Native American monster-- it is a character from an adventure story
written by a white author in 1836. Although the story is narrated as if it were an actual Indian legend, it is not.
The author, John Russell, stated that his Piasa story was merely inspired by 17th-century Indian cliff paintings in Illinois.
(The narrator's discovery of a grisly graveyard of the Piasa monster's victims was also fictional, if you were curious!)

The Piasa cliff paintings had faded away by the time Russell wrote his story, but a Jesuit priest visiting the area drew a
picture of one of them in his journal, which you can see
here.
The monster represented in these "Piasa" paintings was almost certainly the
Underwater Panther, a magical beast of great ceremonial
importance throughout this region which was described as having the form of a cougar with a scaled body, antlers, and a
long prehensile tail. Note the lack of any wings. Underwater panthers are aquatic monsters never depicted as flying in Native
American mythology.

From that point, non-Indian artists and authors took over. Locals have been reproducing images of the
"bluff monster" since the early 1800's, in much more accessible locations than the originals (which were
located high up a sheer cliff face.) Some of the replicas looked like crude teenage graffiti, while others
were quite artistic. Increasingly, they had nothing to do with the original anymore, instead resembling
Greek manticores or hippogriffs. At some point, the replicas sprouted wings. Russell's adventure story
declared the monster a giant bird and gave it the name "Piasa" for the first time-- a name which has stuck
to this day. As for the cliff paintings, the originals-- faded nearly into
invisibility-- were destroyed by quarrying in the mid-1800's. The image that is periodically repainted on the Alton rocks
today is a design created by a white artist in 1924, which bears little resemblance to the original rock art.

So where did the name "Piasa" really come from? The likeliest thing is actually that the author just made it up himself.
The Internet didn't exist in those days, and Russell didn't talk to any Native American people before writing his story.
Still, it's possible that the word "Piasa" could have real Native American origins.
Paissa (also spelled Payiihsa) is a Central Algonquian
word meaning "little people," used to refer to a race of mythical dwarves. They looked nothing like
either the Indian cliff paintings or a giant winged bird, but the Little People were credited with making rock carvings
in many Algonquian tribes, so maybe Russell heard of such a story and made a slightly garbled connection.
Another possibility is that Piyesiw is a Cree name
for the Thunder-Bird.
The Cree have never lived in the Illinois area, but authors at that time did not always care much for historical
details like that. A third possibility is that the father of the Sauk chief Black Hawk was named Pyesa; Russell may have
'borrowed' the name from Black Hawk's autobiography, which was published three years before he wrote his story.